by Kat Griffin Kat Griffin

Deionized Water Systems: Understanding the Basics and Applications for Wire EDM

Deionized Water Systems
In the vast landscape of industrial processes, the significance of deionized water systems often goes unnoticed despite their crucial role in ensuring the quality and efficiency of various operations. From laboratories to manufacturing plants, deionized water is a necessity in numerous industries. This blog post aims to delve into the fundamentals and applications of deionized water systems, with a particular focus on Wire Electrical Discharge Machining (EDM).

What is Deionized Water?

Deionized water, often abbreviated as DI water, is water that has been purified to remove ions and minerals, rendering it highly pure and electrically non-conductive. Unlike distilled water, which primarily removes dissolved solids through boiling and condensation, deionized water undergoes ion exchange processes to achieve its purity.

Understanding Deionized Water Systems

A typical deionized water system comprises several components, including:

  • pretreatment filters
  • ion exchange resin beds
  • posttreatment filters

The process involves removing ions through ion exchange, where positively and negatively charged ions are exchanged for hydrogen and hydroxide ions, resulting in the production of pure water. Various methods such as mixed bed deionization, electrodeionization (EDI), and continuous deionization (CDI) are employed in industrial setups to achieve different levels of purity and efficiency.

Advantages of Deionized Water

There are many benefits to using deionized water, such as its lack of residue, chemical compatibility, reduced scaling, and consistent quality. In addition, its high purity makes deionized water an effective solvent for cleaning applications, making it essential in industries like precision manufacturing processes like wire EDM. Deionized water serves various purposes for wire EDM, such as:

  • Acting as a semiconductor between the energized wire and the workpiece to uphold stable and controlled conditions for ionization in the spark gap.
  • Being capable of chilling to maintain a constant temperature for the wire, workpiece, worktable, and fixtures.
  • This restriction on thermal expansion helps to maintain precise tolerances for both the workpiece and the machine.
  • Serving as a flushing agent to remove the debris generated during cutting operations.

In addition to wire EDM, there are other industries who utilized deionized water, including:

  • Electronics Manufacturing
  • Pharmaceutical Companies
  • Food Processing
  • Medical Offices
  • Car Washes
  • Laboratories and Scientific Research
  • Cosmetics Companies
  • Large Aquariums
  • Plating and Anodizing

Applications of Deionized Water

The applications of deionized water span across multiple industries. In laboratories and scientific research, its purity is paramount for conducting accurate experiments and analyses. In the pharmaceutical and medical sectors, it serves for drug formulations and medical device manufacturing. Moreover, it finds extensive use in electronics manufacturing, power generation, automotive industry, and even in the formulation of cosmetics and personal care products.

Considerations for Selecting Deionized Water Systems

When selecting a deionized water system, several factors must be considered. Factors such as capacity, quality standards, maintenance costs, and customization options for optimal performance are important. The selection process should prioritize these considerations to ensure the system meets specific needs and functions effectively. Each industry may have unique requirements, necessitating careful consideration during the selection process.


Deionized water systems are indispensable assets in modern industries, ensuring the quality and efficiency of various processes. As technology advances, the future of deionized water systems looks promising, with continued innovations aimed at addressing existing challenges and enhancing performance and sustainability. Understanding the fundamentals and applications of deionized water is crucial for maximizing its benefits across diverse industries, including its role in Wire EDM and other precision manufacturing processes.

by Kat Griffin Kat Griffin

Exploring Dielectric Fluid in Wire EDM: An Overview of its Purpose and Functions

dielectric fluid in wire EDM

Wire Electrical Discharge Machining (EDM) is a precision machining process that uses electrical discharges to shape or cut conductive materials. In the wire EDM process, a thin, electrically conductive wire cuts through the workpiece, and dielectric fluid serves as a medium to facilitate the cutting operation.

Historically, deionized water has been the choice for dielectric fluid in wire EDM, whereas oil is commonly utilized in sinker machines. Deionized water plays a crucial role in wire EDM by serving multiple purposes:

  • Electrical Insulation: The deionized water acts as an electrical insulator between the wire electrode and the workpiece. It prevents the electrical discharges from occurring prematurely and ensures that the electrical energy concentrates at the desired cutting point. 
  • Temperature Control: During the wire EDM process, intense heat is generated at the cutting zone due to the electrical discharges. The deionized water cools the cutting zone, preventing excessive heat buildup and maintaining stable machining conditions. 
  • Flushing Agent: Deionized water also serves as a flushing medium. It carries away the debris, metal particles, and erosion products produced during the machining process. This continuous flushing helps maintain a clean cutting area and improves the machining accuracy.



To optimize wire machine performance, users must maintain the cleanliness of their dielectric fluid at all times. If the fluid becomes excessively dirty, it can lead to rusting of materials inside the tank. This can result in compromised surface finish. Implementing effective maintenance practices involves regularly sending the resin for regeneration and periodically replacing the paper-filter cartridges in the system.



Regeneration is a process that takes ion exchange resin beads that are exhausted (fully loaded) and removes ions that have been picked up during the in-service cycle so the resin can continue to be used. An ion exchange system consists of a bed of resin beads with the ability to pick up hardness or other elements by ion exchange.


DI Regeneration Program

Simply send us a PO to regenerate your resin tanks. Include the size of your tank and quantity to be regenerated. We will send you an order confirmation with shipping instructions and your tanks will be regenerated within a few days.  You have the option of filling your tanks with regenerated resin or virgin resin.


Overall, the properties of deionized water make it ideal for wire EDM cutting, providing effective flushing, controlled sparking, temperature management, and cleanliness of the deionized water for optimal machining results.

by Kat Griffin Kat Griffin

What’s the difference between a sinker EDM and wire EDM?

Sinker EDM (Electrical Discharge Machining) and Wire EDM are both machining processes that use electrical discharges to remove material from a workpiece. However, they differ in the way they remove material.

Sinker EDM

Sinker EDM uses a specially shaped electrode, typically made from graphite or copper. The electrode is lowered into the workpiece, electrical current is applied to the electrode and then discharges a series of electrical sparks. The sparks erode the material and create the desired shape.

Sinker EDM can be used to create blind cavities and other features that do not go completely through the material. The electrode is designed to create the desired cavity or feature, and the electrical discharge can be controlled to erode only the material in the desired location.

However, it is also possible to cut completely through the material using sinker EDM if necessary. This can be useful for creating through-holes.

Wire EDM

Wire EDM, on the other hand, uses a thin, electrically charged wire to cut through the workpiece. The wire is guided by computer-controlled motors that move it along the desired cutting path. As the wire cuts through the workpiece, it generates a spark that erodes the material.

In both sinker and wire EDM, the electrode does not physically touch the workpiece material being machined. Instead, an electrical discharge is used to erode the material. This allows for very precise and intricate cuts to be made.

In general, sinker EDM is better suited for making complex shapes in hard materials, while wire EDM is better suited for making straight cuts through thinner materials. Sinker EDM can create very small and intricate shapes with high precision, but it can be slower than wire EDM. Wire EDM, on the other hand, is faster and can be used to cut a wider range of materials.


In summary, both sinker and wire EDM are valuable tools in the manufacturing industry, and the choice between them depends on factors such as the desired shape and material of the workpiece, the required precision and tolerances, and the production volume and cost considerations.